# US 2019/0173653 A1 · Communication method and communications apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0173653 A1 - Document ID: US20190173653A1 - Status: Published application - Kind: A1 - Application number: 16/272,914 - Filed: 2019-02-11 - Published: 2019-06-06 - Earliest claimed: 2016-08-12 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Dan Wu; Lei Chen - Web page: https://patentgrep.com/patent/US20190173653A1 ## CPC - H04L 27/26538: {Filtering per subband or per resource block, e.g. universal filtered multicarrier [UFMC] or generalized frequency division multiplexing [GFDM]} - H04L 5/001: {the frequencies being arranged in component carriers} - H04L 5/0044: {Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH} - H04L 5/0092: {Indication of how the channel is divided} - H04L 5/0094: {Indication of how sub-channels of the path are allocated} - H04L 27/26: Systems using multi-frequency codes (H04L27/32 takes precedence) - H04L 27/2607: {Cyclic extensions} - H04W 72/20: Control channels or signalling for resource management - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract The present disclosure discloses a communication method and a communications apparatus. The method includes: determining, by a first communications device, a first subcarrier spacing corresponding to a first subband; and performing, by the first communications device, signal transmission on the first subband with a second communications device based on the first subcarrier spacing; or determining, by a first communications device, a second subcarrier spacing corresponding to a second subband; and performing, by the first communications device, signal transmission on the second subband with a second communications device based on the second subcarrier spacing. The first subcarrier spacing is different from the second subcarrier spacing, and both the first subcarrier spacing and the second subcarrier spacing are integral multiples of a basic frequency spacing; and both bandwidth of the first subband and bandwidth of the second subband are integral multiples of the basic frequency spacing. ## Claims ### Claim 1 A signal sending method, comprising: obtaining to-be-sent frequency domain data; determining a first subband for transmitting the data, wherein a subcarrier spacing of the first subband is an integral multiple of a basic frequency spacing; performing subcarrier mapping in the first subband for the data, wherein a subcarrier that is used to perform the subcarrier mapping is a subcarrier that is in the determined first subband and located at a frequency that is an integral multiple of the subcarrier spacing of the first subband, and frequency locations of subcarriers that are used to perform subcarrier mapping in different subbands do not overlap with each other; performing inverse fast Fourier transformation (IFFT) on the subcarrier obtained after the subcarrier mapping, to obtain a time domain signal; performing an operation of adding a cyclic prefix on the time domain signal; filtering the signal to which the cyclic prefix has been added; and sending the filtered signal. ### Claim 2 (depends on 1) The method according to claim 1, further comprising: determining data bandwidth that is used to send the data in the first subband, the subcarrier spacing of the first subband and a start frequency location at which the mapping is performed in the first subband; and determining, based on the data bandwidth, the subcarrier spacing of the first subband and the start frequency location, a frequency location of the subcarrier that is used to perform the subcarrier mapping. ### Claim 3 (depends on 2) The method according to claim 2, wherein when the signal is a downlink signal, the method further comprises: notifying a terminal device of information about the data bandwidth, information about the start frequency location, and information about the subcarrier spacing of the first subband. ### Claim 4 (depends on 2) The method according to claim 2, wherein when the signal is a downlink signal, the method further comprises: notifying a terminal device of information about the data bandwidth, information about the start frequency location and information about a type or a number of the first subband, wherein the information about the type or the number of the first subband is used to determine the subcarrier spacing of the first subband. ### Claim 5 (depends on 2) The method according to claim 2, wherein when the signal is an uplink signal, the method further comprises: receiving, from a network device, information about the data bandwidth, information about the subcarrier spacing and information about the start frequency location. ### Claim 6 (depends on 2) The method according to claim 2, wherein when the signal is an uplink signal, the method further comprises: receiving, from a network device, information about the data bandwidth, information about the start frequency location and information about a type or a number of the first subband, wherein the information about the type or the number of the first subband is used to determine the subcarrier spacing of the first subband. ### Claim 7 A receiving method, comprising: receiving signals comprising data carried in different subbands; performing subband filtering on the received signals to obtain a signal of a first subband in which data of a terminal device resides; removing a cyclic prefix from the signal of the first subband; performing fast Fourier transformation (FFT) on the signal from which the cyclic prefix has been removed to obtain a frequency domain signal; extracting, at a frequency location at which subcarrier mapping is performed in the first subband for the data of the terminal device, frequency domain data of the terminal device from the frequency domain signal, wherein the frequency location is a location of a frequency that is an integral multiple of a subcarrier spacing of the first subband, the subcarrier spacing of the first subband is an integral multiple of a basic frequency spacing, and frequency locations of subcarriers that are used to perform subcarrier mapping in different subbands do not overlap with each other; and performing signal detection on the extracted frequency domain data, to restore the data of the terminal device. ### Claim 8 (depends on 7) The method according to claim 7, further comprising: determining data bandwidth that is used to send the data of the terminal device in the first subband, the subcarrier spacing of the first subband and a start frequency location at which the mapping is performed in the first subband; and determining, based on the data bandwidth, the subcarrier spacing of the first subband and the start frequency location, the frequency location at which the subcarrier mapping is performed in the first subband for the data of the terminal device. ### Claim 9 (depends on 8) The method according to claim 8, wherein when the signal is a downlink signal, the method further comprises: receiving, from a network device, information about the data bandwidth, information about the start frequency location and information about the subcarrier spacing of the first subband. ### Claim 10 (depends on 8) The method according to claim 8, wherein when the signal is a downlink signal, the method further comprises: receiving, from a network device, information about the data bandwidth, information about the start frequency location and information about a type or a number of the first subband, wherein the information about the type or the number of the first subband is used to determine the subcarrier spacing of the first subband. ### Claim 11 (depends on 8) The method according to claim 8, wherein when the signal is an uplink signal, the method further comprises: sending, to the terminal device, information about the data bandwidth, information about the subcarrier spacing of the first subband and information about the start frequency location. ### Claim 12 (depends on 8) The method according to claim 8, wherein when the signal is an uplink signal, the method further comprises: sending, to the terminal device, information about the data bandwidth, information about the start frequency location and information about a type or a number of the first subband, wherein the information about the type or the number of the first subband is used to determine the subcarrier spacing of the first subband. ### Claim 13 A sending apparatus, comprising: a memory, configured to store instructions; and a processor, configured to execute the instructions stored in the memory and, when executed by the processor, cause the sending apparatus to: obtain to-be-sent frequency domain data, determine a first subband for transmitting the data, wherein a subcarrier spacing of the first subband is an integral multiple of a basic frequency spacing, perform subcarrier mapping in the first subband for the data, wherein a subcarrier that is used to perform the subcarrier mapping is a subcarrier that is in the determined first subband and located at a frequency that is an integral multiple of the subcarrier spacing of the first subband, and frequency locations of subcarriers that are used to perform subcarrier mapping in different subbands do not overlap with each other, perform inverse fast Fourier transformation (IFFT) on the subcarrier obtained after the subcarrier mapping, to obtain a time domain signal, perform an operation of adding a cyclic prefix on the time domain signal, filter the signal to which the cyclic prefix has been added, and send the filtered signal. ### Claim 14 (depends on 13) The apparatus according to claim 13, wherein the instructions stored in the memory, when executed by the processor, further cause the sending apparatus to: determine data bandwidth that is used to send the data in the first subband, the subcarrier spacing of the first subband and a start frequency location at which the mapping is performed in the first subband; and determine, based on the data bandwidth, the subcarrier spacing of the first subband and the start frequency location, a frequency location of the subcarrier that is used to perform the subcarrier mapping. ### Claim 15 (depends on 14) The apparatus according to claim 14, wherein when the signal is a downlink signal, the instructions stored in the memory, when executed by the processor, further cause the sending apparatus to: notify a terminal device of information about the data bandwidth, information about the start frequency location, and information about the subcarrier spacing of the first subband; or notify a terminal device of information about the data bandwidth, information about the start frequency location and information about a type or a number of the first subband, wherein the information about the type or the number of the first subband is used to determine the subcarrier spacing of the first subband. ### Claim 16 (depends on 14) The apparatus according to claim 14, wherein when the signal is an uplink signal, the instructions stored in the memory, when executed by the processor, further cause the sending apparatus to: receive, from a network device, information about the data bandwidth, information about the subcarrier spacing and information about the start frequency location; or receive, from a network device, information about the data bandwidth, information about the start frequency location and information about a type or a number of the first subband, wherein the information about the type or the number of the first subband is used to determine the subcarrier spacing of the first subband. ### Claim 17 A receiving apparatus, comprising: a memory, configured to store instructions; and a processor, configured to execute the instructions stored in the memory and, when executed by the processor, cause the receiving apparatus to: receive signals comprising data carried in different subbands, perform subband filtering on the received signals, to obtain a signal of a first subband in which data of a terminal device resides, remove a cyclic prefix from the signal of the first subband, perform fast Fourier transformation (FFT) on the signal from which the cyclic prefix has been removed, to obtain a frequency domain signal, extract, at a frequency location at which subcarrier mapping is performed in the first subband for the data of the terminal device, frequency domain data of the terminal device from the frequency domain signal, wherein the frequency location is a location of a frequency that is an integral multiple of a subcarrier spacing of the first subband, the subcarrier spacing of the first subband is an integral multiple of a basic frequency spacing, and frequency locations of subcarriers that are used to perform subcarrier mapping in different subbands do not overlap with each other, and perform signal detection on the extracted frequency domain data, to restore the data of the terminal device. ### Claim 18 (depends on 17) The apparatus according to claim 17, wherein the instructions stored in the memory, when executed by the processor, further cause the receiving apparatus to: determine data bandwidth that is used to send the data of the terminal device in the first subband, the subcarrier spacing of the first subband and a start frequency location at which the mapping is performed in the first subband; and determine, based on the data bandwidth, the subcarrier spacing of the first subband and the start frequency location, the frequency location at which the subcarrier mapping is performed in the first subband for the data of the terminal device. ### Claim 19 (depends on 18) The apparatus according to claim 18, wherein when the signal is a downlink signal, the instructions stored in the memory, when executed by the processor, further cause the receiving apparatus to: receive, from a network device, information about the data bandwidth, information about the start frequency location and information about the subcarrier spacing of the first subband; or receive, from a network device, information about the data bandwidth, information about the start frequency location and information about a type or a number of the first subband, wherein the information about the type or the number of the first subband is used to determine the subcarrier spacing of the first subband. ### Claim 20 (depends on 18) The apparatus according to claim 18, wherein when the signal is an uplink signal, the instructions stored in the memory, when executed by the processor, further cause the receiving apparatus to: send, to the terminal device, information about the data bandwidth, information about the subcarrier spacing of the first subband and information about the start frequency location; or send, to the terminal device, information about the data bandwidth, information about the start frequency location and information about a type or a number of the first subband, wherein the information about the type or the number of the first subband is used to determine the subcarrier spacing of the first subband.